Governing mechanism for mixed-pressure turbines.



W. PAPE. GOVERNtNG MEGHANISM FOR MIXED PRESSURE TURBINES.

APPLICATION FILED DEO.27,1911.

1,064,762, Patented June 17,1913.

Inventor;

Wilhel pape, wmtt WILHELM rare, or CHARLOTTENBURG, snnjMAnY, ssronon To GENERAL nnnornio COMPANY, A conronnrroiv or NEW YORK.

GOVERNING MECHANISM FOR, MIXED-PRESSURE TUE-BIKES.

I Specification of Iietters Patent.

Patented June 7, 1913.

Application filed December 27, 1911. Serial No. 668,129.

To all whom it may concern:

Be it-known that I, WILHE M PAPE, a subject of the King of Prussia, residing at Charlottenburg, Germany, have invented certain new and useful Improvements in Governing Mechanism for Mixed-Pressure duced in advance. of the low-pressure part these conditions becomes impossible.

main open. This opening mt the turbine which 'is'above that of the atmosphere. Consequently steam from this stage will pass through the low pressure throttle valve into the accumulator and the pressure regulator, the latter modifying the action of the speed governor on the valve mechanism. The movable part of the pressure regulatorwill therefore be carried to its'highest position and held fast, so that the low-pressure valve will constantly resure valve causes the h gh-pressure valve to I close, assuming aconnection between them,.so that high pressure operation under In order to, obviate this difficulty I have devised a mechanism which permits of the pressure regulator being hold fast in its lowest position, so that the low-pressure valve will remain completely closed while the turbine is startedwith live or high pressure steam.-

In the accompanying .drawing is shown one of the embodiments of my invention wheremt F gure 1 is an end view of a. mixed pressure turbine; Fig. 2 is a diagrammatic illus tration of the governing mechanism therefor; .Fig. '3 is a sectional, view of thelow pressure valve actuating motor and its pilot valve; and Fig. 4 is a detail of a valve.

1 indicates a mixed pressure turbine hava low pressure admission valve 2 and in a iigh-pressure admission valve 3. The

low pressure steam is received from an accumulator & that is connected by the pipe of the low pres- 5 with the exhaust of a reciprocating or other engine. High pressure steam is ad mitted to the turbine I'1'O111 a boiler by the cylinder 12, a piston 13 and a piiot valve 1.4 of usual construction.

15 indicates a speed governor that driven by the shaft 16 which be the main shaft of the turbine or a secondary shaft. 11; is provided with a sliding collar 17 which is connected to the weights and also to a lever 18 pivoted at'19 to a fixedsupport. The left hand side of the governor collar is pivotally attached to the lever 18*, the latter being pivotally connected to the piston rod 20. The right hand end of the lever 18 is connected by a link 21 to a sec ondary governor leverfiQ. The lever 22 is pivotally attached to "and operates the pilot valve 14 and is also attached to the rod Pivotally connected to the piston rods 26 and 24 is a lever 25that is also pivotally attached to the rod-23 and actuates the pint valve 14: under certain conditions.

26 indicates a pressure regulator comprising a cylinder 27 and a piston and its rod 28, the latter being connected to the lever 29. Fluid under pressure is admitted by the pipe 30 from theaccumulator 4. Acting in opposition to the pressure is acoiled compression spring 31. The'left hand end of the lever 29 is connected to the sleeve 11 of the pilot valve, said sleeve. cooperating with the pilot valve to regulate the admission of fluid to the motor, andbeing adjusted as to its position in response to pressiire changesin the. accumulator. At the lower end of the ported sleeve is a dash pot comprising a piston 32 and a cylinder 83 Carried by the piston are valves 34. that open freely as the piston moves downward and close as it moves upward to retard its action. As shown in Fig. e, these valves are provided 'within the condenser. As the pressure regulator is pivo-tally attached to the lever 29 and forms an adjustable fulcrum therefor which 1s responsive to pressure changes changes the fulcrum is raised or lowered. It will therefore be seen that the low pressure valve means is acted upon by a speed governor, by a regulator responsive to changes in accumulator pressure, and by a regulator responsive to condenser pressure. If the pressure within the condenser rises, as it would if the pumps were not working, the fulcrum of the lever 29 is moved upwardly thereby depressing the ported sleeve 11 which opens the ports leading from the pilot valve to the motor in a manner to cause the low pressure valve means to close. The turbine will noW operate with high pressure steam because the regulator responsive to accumulator pressure is prevented from acting; Disturbance to the operation is therefore avoided since it is possible, even with a rather poor vacuum to maintain the full load duty on the turbine even when the supply of low pressure steam is no longer suflicient to carry the load.

For normal operationthe speed governor moves the pilot valves in their proper sequence as the load changes thereby causing the turbine to receive and be driven by low pressure steam so long as the supply is sufficient, to receive a mixture of low and high pressure steam and finally to receive high pressure steam only. This control of the valves by the governor is modified by the action of the regulator that is responsive to the ressure of thesource of low pressure supply, 2'. e. the steam in the accumulator 4.

- Moving the sleeve 11 has the effect of giving a greater opening to the motor ports tha is given by the action of the speed governor. The low and high pressure valves 2 and 3 are connected together in the sense that the closing of the valve2 in response to the action of the pressureregulator 26 causes the valve 3 to open due to the arrangement of the lever 25, rod 23 and lever This last mentioned feature is not claimed herein because it forms the subject matter of a patent of mine No. 1,029,311 of June 11, 1912.

' In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof; but I desireto have it understood that the apparatus shown is only illustrative, and that the invention can be carried out by other means.

What I claim as new and desire to secure by Letters Patent of the United States, is 2- 1.. In combination, a mixed pressure turbine, conduits admitting low and high pressure motive fluid thereto, valve means controlling the passage of fluid therethrough, a

governor controlling the action of bothvalve means, a pressure regulator that modifies the action of the governor on said means,

and a second pressure governor that under piertain conditions modifies the action of the rst.

2. In combination, a mixed pressure turbine, conduits admitting low and highpressure motive fluid thereto, valve means controlling the passage of fluid therethrough, a condenser receiving the exhaust of the turbine, a governor controlling the valve means, a regulator responsive to the pressure of the low pressure source, and a second regulator responsive to exhaust pressure, both of said regulators modifying the action of the governor on said valve means.

3. In combination, a mixed pressure turbine, conduits admitting low and high pres-.

sure motive fluid thereto, valve means controlling the passage of fluid therethrough, a speed governor driven by the turbine for controlling the valve means, a regulator responsive to the pressure of fluid supplied to the turbine, and a second regulator responsive to the exhaust pressure of the turbine, both of said regulators modifying the action of the speed governor.

4. In combination, a mixed presure turbine, conduits admitting low and high pres sure motive fluid thereto, valve means controlling the passage of fluid therethrough, the valve means for the low pressure source tending to open when high pressure fluid is admitted for the purpose of starting, and a regulator that overcomes said tendency and temporarily holds said valve means closed.

5. In combination, a mixed pressure-turbine, conduits admitting low and high pressure motive fluid thereto, valve means controlling the passage of fluid therethrough, a governor controlling both of said valve means, a motor for actuating the low pressure valve means, a controller for the motor comprising two principal parts, one of said parts being actuated by the governor, means responsive to pressure for actuating the second part, and a regulator that under certain conditions assumes control cf the second part to the exclusion of the said means.

(3. In combination, a mixed pressure turbine, conduits admitting low and high pressure fluid thereto, valve means in the conduits, a governor common to both means, a motor for actuating the low pressure valve means, a controller for the motor comprising two principal parts, a regulator responsive to the pressure of one of the sources for actuating one part of the controller, and a second regulator responsive to the vexhaust pressure of the turbine for actuating the other part of the controller.

- 7. In combination, a mixed pressure turbine, conduits admitting low and high pressure fluid thereto, valve means in the condults, means responsive to speed changes of the turbine for controlling the valve means,

tain conditions, later that temporarily action of the first.

and a second pressure regunullifies the efi'ective.

In Witness whereof, I have hereunto set my hand this fifth day of Decbn, 1911.

W'ILHELM PAPE.

Vvitnesses HENRY HASPER, WOLDEMAR HAUP'r. 

